Instagram is positively teeming with new users. Within weeks of the announcement that the company would be acquired by Facebook and the launch of an app for the Android platform, the number of Instagram users ballooned from 30 million to 50 million. The influx of novice Insta-fans has caused a bit of a stir among more seasoned users, as newbies run into questions about community etiquette as they figure out how to use the app and its features. What infuriates established users; what should never be posted; how can more followers be acquired?